/*
 * (c) Copyright IBM Corp. 2000, 2001.
 * All Rights Reserved.
 */
package net.sourceforge.phpdt.internal.ui.text.template;

import net.sourceforge.phpdt.internal.corext.template.Template;
import net.sourceforge.phpdt.internal.corext.template.TemplateBuffer;
import net.sourceforge.phpdt.internal.corext.template.TemplateContext;
import net.sourceforge.phpdt.internal.corext.template.TemplateMessages;
import net.sourceforge.phpdt.internal.corext.template.TemplatePosition;
import net.sourceforge.phpdt.internal.corext.template.java.CompilationUnitContext;
import net.sourceforge.phpdt.internal.corext.template.java.JavaTemplateMessages;
import net.sourceforge.phpdt.internal.ui.text.java.IJavaCompletionProposal;
import net.sourceforge.phpeclipse.PHPeclipsePlugin;
import org.eclipse.core.runtime.CoreException;
import net.sourceforge.phpdt.internal.ui.text.link.LinkedPositionManager;
import net.sourceforge.phpdt.internal.ui.text.link.LinkedPositionUI;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.contentassist.IContextInformation;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Shell;
//import org.eclipse.jdt.internal.ui.text.link.LinkedPositionManager;
//import org.eclipse.jdt.internal.ui.text.link.LinkedPositionUI;
//import org.eclipse.jdt.internal.ui.util.ExceptionHandler;

/**
 * A PHP identifier proposal.
 */
public class BuiltInProposal implements IJavaCompletionProposal {

  private final String fTemplate;
  private final TemplateContext fContext;
  private final ITextViewer fViewer;
  private final Image fImage_builtin;

  private final IRegion fRegion;

  //private TemplateBuffer fTemplateBuffer;
  private String fOldText;
  private IRegion fSelectedRegion; // initialized by apply()

  /**
   * Creates a template proposal with a template and its context.
   * @param template  the template
   * @param context   the context in which the template was requested.
   * @param image     the icon of the proposal.
   */
  public BuiltInProposal(String template, TemplateContext context, IRegion region, ITextViewer viewer, Image image_builtin) {
    //		Assert.isNotNull(template);
    //		Assert.isNotNull(context);
    //		Assert.isNotNull(region);
    //		Assert.isNotNull(viewer);

    fTemplate = template;
    fContext = context;
    fViewer = viewer;
   	fImage_builtin= image_builtin;
    fRegion = region;
  }

  /*
   * @see ICompletionProposal#apply(IDocument)
   */
  public void apply(IDocument document) {
    try {
      //		    if (fTemplateBuffer == null)
      //				fTemplateBuffer= fContext.evaluate(fTemplate);

      int start = fRegion.getOffset();
      int end = fRegion.getOffset() + fRegion.getLength();

      // insert template string
    //  String templateString = fTemplate; // fTemplateBuffer.getString();	
      document.replace(start, end - start, fTemplate);

      // translate positions
      LinkedPositionManager manager = new LinkedPositionManager(document);
      //			TemplatePosition[] variables= fTemplateBuffer.getVariables();
      //			for (int i= 0; i != variables.length; i++) {
      //				TemplatePosition variable= variables[i];
      //
      //				if (variable.isResolved())
      //					continue;
      //				
      //				int[] offsets= variable.getOffsets();
      //				int length= variable.getLength();
      //				
      //				for (int j= 0; j != offsets.length; j++)
      //					manager.addPosition(offsets[j] + start, length);
      //			}

      LinkedPositionUI editor = new LinkedPositionUI(fViewer, manager);
      editor.setFinalCaretOffset(fTemplate.length()+start);
   //   editor.setFinalCaretOffset(getCaretOffset(fTemplateBuffer) + start);
      editor.enter();

      fSelectedRegion = editor.getSelectedRegion();

    } catch (BadLocationException e) {
      PHPeclipsePlugin.log(e);
      openErrorDialog(e);

    }
    //      catch (CoreException e) {
    //			handleException(e);
    //	    }	    
  }

//  private static int getCaretOffset(TemplateBuffer buffer) {
//    TemplatePosition[] variables = buffer.getVariables();
//    for (int i = 0; i != variables.length; i++) {
//      TemplatePosition variable = variables[i];
//
//      if (variable.getName().equals(JavaTemplateMessages.getString("GlobalVariables.variable.name.cursor"))) //$NON-NLS-1$
//        return variable.getOffsets()[0];
//    }
//
//    return buffer.getString().length();
//  }

  /*
   * @see ICompletionProposal#getSelection(IDocument)
   */
  public Point getSelection(IDocument document) {
    return new Point(fSelectedRegion.getOffset(), fSelectedRegion.getLength());
    //	  return null;
  }

  /*
   * @see ICompletionProposal#getAdditionalProposalInfo()
   */
  public String getAdditionalProposalInfo() {
    //	    try {
    //			if (fTemplateBuffer == null)
    //				fTemplateBuffer= fContext.evaluate(fTemplate);

    return textToHTML(fTemplate); // fTemplateBuffer.getString());

    //	    } catch (CoreException e) {
    //			handleException(e);		    
    //			return null;
    //	    }
  }

  /*
   * @see ICompletionProposal#getDisplayString()
   */
  public String getDisplayString() {
    return fTemplate + TemplateMessages.getString("TemplateProposal.delimiter") + fTemplate; // $NON-NLS-1$ //$NON-NLS-1$
    //		return fTemplate.getName() + TemplateMessages.getString("TemplateProposal.delimiter") + fTemplate.getDescription(); // $NON-NLS-1$ //$NON-NLS-1$
  }

  /*
   * @see ICompletionProposal#getImage()
   */
  public Image getImage() {
 		return fImage_builtin;
  }

  /*
   * @see ICompletionProposal#getContextInformation()
   */
  public IContextInformation getContextInformation() {
    return null;
  }

  private static String textToHTML(String string) {
    StringBuffer buffer = new StringBuffer(string.length());
    buffer.append("<pre>"); //$NON-NLS-1$

    for (int i = 0; i != string.length(); i++) {
      char ch = string.charAt(i);

      switch (ch) {
        case '&' :
          buffer.append("&amp;"); //$NON-NLS-1$
          break;

        case '<' :
          buffer.append("&lt;"); //$NON-NLS-1$
          break;

        case '>' :
          buffer.append("&gt;"); //$NON-NLS-1$
          break;

        case '\t' :
          buffer.append("    "); //$NON-NLS-1$
          break;

        case '\n' :
          buffer.append("<br>"); //$NON-NLS-1$
          break;

        default :
          buffer.append(ch);
          break;
      }
    }

    buffer.append("</pre>"); //$NON-NLS-1$
    return buffer.toString();
  }

  private void openErrorDialog(BadLocationException e) {
    Shell shell = fViewer.getTextWidget().getShell();
    MessageDialog.openError(shell, TemplateMessages.getString("TemplateEvaluator.error.title"), e.getMessage()); //$NON-NLS-1$
  }

  private void handleException(CoreException e) {
    Shell shell = fViewer.getTextWidget().getShell();
    PHPeclipsePlugin.log(e);
    //		ExceptionHandler.handle(e, shell, TemplateMessages.getString("TemplateEvaluator.error.title"), null); //$NON-NLS-1$
  }

  /*
   * @see IJavaCompletionProposal#getRelevance()
   */
  public int getRelevance() {

    if (fContext instanceof CompilationUnitContext) {
      CompilationUnitContext context = (CompilationUnitContext) fContext;
      switch (context.getCharacterBeforeStart()) {
        // high relevance after whitespace
        case ' ' :
        case '\r' :
        case '\n' :
        case '\t' :
          return 90;

        default :
          return 0;
      }
    } else {
      return 90;
    }
  }

}